add new dockerfile for terraform (#312)

terraform/Dockerfile

@@ -0,0 +1,37 @@
+FROM alpine:3.6
+LABEL maintainer "Sid Carter <me@sidcarter.com>"
+
+ENV PATH /go/bin:/usr/local/go/bin:$PATH
+ENV GOPATH /go
+
+RUN	apk --no-cache add \
+	ca-certificates
+
+ENV TERRAFORM_VERSION v0.11.0
+
+RUN buildDeps=' \
+		bash \
+		go \
+		git \
+		gcc \
+		g++ \
+		libc-dev \
+		libgcc \
+		make \
+		zip \
+	' \
+	set -x \
+	&& apk --no-cache add --repository https://dl-3.alpinelinux.org/alpine/edge/community $buildDeps \
+	&& go get github.com/Soulou/curl-unix-socket \
+	&& mv /go/bin/curl-unix-socket /usr/bin/ \
+	&& mkdir -p /go/src/github.com/hashicorp /etc/terraform.d \
+	&& git clone --depth 1 --branch ${TERRAFORM_VERSION} https://github.com/hashicorp/terraform /go/src/github.com/hashicorp/terraform \
+	&& cd /go/src/github.com/hashicorp/terraform \
+	&& XC_ARCH="amd64" XC_OS="linux" make bin \
+	&& mv pkg/linux_amd64/terraform /usr/bin/ \
+	&& apk del $buildDeps \
+	&& rm -rf /go \
+	&& echo "Build complete."
+
+
+ENTRYPOINT [ "terraform" ]